U.S. patent application number 11/524463 was filed with the patent office on 2008-03-27 for tool structure.
Invention is credited to Jin Fu Chen.
Application Number | 20080072716 11/524463 |
Document ID | / |
Family ID | 39223507 |
Filed Date | 2008-03-27 |
United States Patent
Application |
20080072716 |
Kind Code |
A1 |
Chen; Jin Fu |
March 27, 2008 |
Tool structure
Abstract
A tool structure composed of two pivotally connected handles and
a tool head. The handle pivot shaft of the handles is spaced from
the head pivot shaft of the tool head by a certain distance to form
a double-lever structure for saving strength. A pin member is
fitted through each handle in parallel to the handle pivot shaft,
whereby the pin members can be forced to axially move within the
handles. Each pin member has a large diameter section and a small
diameter section. When replacing the tool head, a user only needs
to press the pin members of the handles with a hand. At this time,
the large diameter sections of the pin members are detached from
the insertion notches of the tool head to easily replace the tool
head with another tool head with different usage. The replacement
can be completed without using any tool. Therefore, the tool head
can be quickly assembled with the handles.
Inventors: |
Chen; Jin Fu; (Dali City,
TW) |
Correspondence
Address: |
ROSENBERG, KLEIN & LEE
3458 ELLICOTT CENTER DRIVE-SUITE 101
ELLICOTT CITY
MD
21043
US
|
Family ID: |
39223507 |
Appl. No.: |
11/524463 |
Filed: |
September 21, 2006 |
Current U.S.
Class: |
81/423 ;
81/415 |
Current CPC
Class: |
B25B 7/12 20130101; B25B
7/14 20130101; B25B 7/00 20130101 |
Class at
Publication: |
81/423 ;
81/415 |
International
Class: |
B25B 7/02 20060101
B25B007/02 |
Claims
1. A tool structure comprising: two handles pivotally connected
with each other via a handle pivot shaft, a pin member being fitted
through each handle in parallel to the handle pivot shaft, whereby
the pin members can be forced to axially move within the handles,
each pin member having a large diameter section and a small
diameter section, the large diameter section having a diameter
larger than the diameter of the small diameter section, the small
diameter section being fitted through the handle to protrude from
the handle, a stopper member being fixed with the protruding end of
the small diameter section protruding from the handle; and a tool
head composed of two clamping members, the clamping members being
pivotally connected with each other via a head pivot shaft, the
handle pivot shaft being spaced from the head pivot shaft by a
certain distance, each clamping member having an insertion section
formed with an insertion notch, the insertion notch having an
opening with a width smaller than the inner diameter of the
insertion notch and the diameter of the large diameter section of
the pin member, the width of the opening being larger than the
diameter of the small diameter section of the pin member, whereby
in normal state, the large diameter sections of the pin members are
pivotally disposed in the insertion notches of the insertion
sections.
2. The tool structure as claimed in claim 1, wherein the large
diameter section of the pin member is cylindrical, while the
cross-section of the small diameter section of the pin member has
two long sections and two short sections, a distance between the
long sections being defined as a first length, while the distance
between the two short sections being defined as a second length,
the first length being longer than the second length, the width of
the opening of the insertion section being smaller than the first
length and larger than the second length.
3. The tool structure as claimed in claim 1, wherein both the large
diameter section and small diameter section of the pin member are
cylindrical.
4. The tool structure as claimed in claim 1, wherein the insertion
section of the clamping member has a head locating point, whereby
the tool head can be truly closed and located.
5. The tool structure as claimed in claim 1, wherein each handle
has a handle locating point near the handle pivot shaft, whereby
the handles can be truly closed and located.
6. The tool structure as claimed in claim 1, wherein the stopper
member is screwed on the protruding end of the small diameter
section of the pin member, a spring being disposed between the
stopper member and the handle, two ends of the spring respectively
abutting against the stopper member and the handle, whereby after
the pin member is pressed, the spring can restore the pin member to
its home position where the large diameter section is positioned in
the handle.
7. The tool structure as claimed in claim 1, wherein each handle
has a leaf spring, the pin member having a head end section
adjacent to the large diameter section, the leaf spring abutting
against the head end section, whereby after pressed, the large
diameter section of the pin member can be restored to its home
position in the handle.
8. The tool structure as claimed in claim 1, wherein a switch plate
is disposed on the protruding ends of the small diameter sections
of the pin members, a middle section of the switch plate being
formed with a press face between the two pin members.
9. The tool structure as claimed in claim 8, wherein one of the
stopper members is formed with a receptacle having a stopper
section, the switch plate having a chucked section corresponding to
the receptacle of the stopper member, the switch plate further
having a driving section adjacent to the chucked section.
Description
BACKGROUND OF THE INVENTION
[0001] The present invention is related to a tool structure, and
more particularly to a tool structure in which the tool head can be
easily replaced with another tool head with different usage.
[0002] FIG. 9 shows a conventional tool having two handles 8. When
the handles 8 are fully opened, the short sections 811 of the
fixing pins 81 of the handles 8 can be aligned with the openings 91
of the tool head 9. At this time, the insertion sections 93 of the
tool head 9 can be inserted into the handles 8 with the fixing pins
81 inserted in the insertion notches 92 of the tool head 9. Then
the handles 9 are closed. The handles 8 are spaced from the pivot
shaft 94 of the tool head 9 by a certain distance, whereby the
fixing pins 81 can be rotated within the insertion notches 92 of
the tool head 9. The long sections 812 of the fixing pins 81
prevent the tool head 9 from detaching from the handles 8.
Therefore, the handles 8 and the tool head 9 can be firmly
assembled. When replacing the tool head with another tool head with
different usage, the handles 8 are fully opened to align the short
sections 811 of the fixing pins 81 of the handles 8 with the
openings 91 of the tool head 9. Then the tool head 9 can be easily
detached from the handles 8 and the other tool head can be inserted
into the handles 8.
[0003] The above structure has a shortcoming that only when the
handles 8 are fully opened and the tool head 9 is fully opened, the
short sections 811 of the fixing pins 81 of the handles 8 can be
accurately aligned with the openings 91 of the tool head 9 for
taking out and replacing the tool head 9. It is dangerous to
replace the tool head 9. This is because the fully opened tool head
9 tends to drop down to hurt somebody.
SUMMARY OF THE INVENTION
[0004] It is therefore a primary object of the present invention to
provide an improved tool structure in which the handle pivot shaft
is spaced from the head pivot shaft by a certain distance. Also,
the pin members of the handles are pivotally fitted in the
insertion notches of the tool head so as to form a double-lever
structure for saving strength. Furthermore, when replacing the tool
head, a user only needs to press the pin members of the handles
with a hand to easily replace the tool head with another tool head
with different usage, such as a scissors, a pincers, etc. The
replacement can be completed without using any tool. Therefore, the
tool head can be quickly assembled with the handles.
[0005] It is a further object of the present invention to provide
the above tool structure in which a switch plate is disposed on the
pin members of the handles. When a user presses the press face of
the middle section of the switch plate, the two pin members are
simultaneously pressed down to conveniently replace the tool
head.
[0006] It is still a further object of the present invention to
provide the above tool structure in which the switch plate is
disposed on the protruding ends of the pin members. Two stopper
members are screwed on the protruding ends of the pin members. One
of the stopper members is formed with a receptacle having a stopper
section. The chucked section of the switch plate is chucked in the
stopper member, whereby the switch plate prevents the handles from
being freely opened. When not used, the two handles will not be
unexpectedly opened to cause danger.
[0007] It is still a further object of the present invention to
provide the above tool structure in which each insertion section of
the tool head has ahead locating point, whereby when replacing the
tool head, the tool head can be truly closed and located.
[0008] It is still a further object of the present invention to
provide the above tool structure in which each handle has a handle
locating point near the handle pivot shaft, whereby when replacing
the tool head, the handles can be truly closed and located in a
position for easily replacing the tool head.
[0009] It is still a further object of the present invention to
provide the above tool structure in which the small diameter
section of the pin member is a flattened cylinder. Only when the
tool head and the handles are closed, the tool head can be
assembled with the handles. That is, the tool head and the handles
must be fixed at a specific angle for the assembly. This ensures
the safety in replacement of the tool head.
[0010] It is still a further object of the present invention to
provide the above tool structure in which both the large diameter
section and small diameter section of the pin member are
cylindrical. The replacement of the tool head can be performed in
any closing angle. This is quite convenient to the user.
[0011] According to the above objects, the tool structure of the
present invention includes:
[0012] two handles pivotally connected with each other via a handle
pivot shaft, a pin member being fitted through each handle in
parallel to the handle pivot shaft, whereby the pin members can be
forced to axially move within the handles, each pin member having a
large diameter section and a small diameter section, the large
diameter section having a diameter larger than the diameter of the
small diameter section, the small diameter section being fitted
through the handle to protrude from the handle, a stopper member
being fixed with the protruding end of the small diameter section
protruding from the handle; and
[0013] a tool head composed of two clamping members, the clamping
members being pivotally connected with each other via a head pivot
shaft, the handle pivot shaft being spaced from the head pivot
shaft by a certain distance, each clamping member having an
insertion section formed with an insertion notch, the insertion
notch having an opening with a width smaller than the inner
diameter of the insertion notch and the diameter of the large
diameter section of the pin member, the width of the opening being
larger than the diameter of the small diameter section of the pin
member, whereby in normal state, the large diameter sections of the
pin members are pivotally disposed in the insertion notches of the
insertion sections.
[0014] The present invention can be best understood through the
following description and accompanying drawings wherein:
BRIEF DESCRIPTION OF THE DRAWINGS
[0015] FIG. 1 is a perspective exploded view of a first embodiment
of the present invention;
[0016] FIG. 2 is a front view of the first embodiment of the
present invention;
[0017] FIG. 3 shows the relationship between the positions of the
insertion sections of the tool head and the pin members of the
handles of the first embodiment of the present invention when
replacing the tool head;
[0018] FIG. 4 is a sectional view of the first embodiment of the
present invention;
[0019] FIG. 5 shows the replacement of the tool head of the first
embodiment of the present invention;
[0020] FIG. 6 is a sectional view of a second embodiment of the
present invention;
[0021] FIG. 7 is a sectional view according to FIG. 6, showing the
replacement of the tool head of the second embodiment of the
present invention;
[0022] FIG. 8 is a perspective exploded view of a third embodiment
of the present invention; and
[0023] FIG. 9 shows that the handles of a conventional tool are
fully opened for taking out the tool head.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS
[0024] Please refer to FIGS. 1 to 5. The tool structure of the
present invention includes two handles 1 pivotally connected with
each other via a handle pivot shaft 12. A pin member 11 is fitted
through each handle 1 in parallel to the handle pivot shaft 12. The
pin members 11 can be forced to axially move within the handles 1.
Each pin member 11 has a large diameter section 111 and a small
diameter section 112. The large diameter section 111 has a diameter
larger than the diameter of the small diameter section 112. The
small diameter section 112 is fitted through the handle 1 to
protrude from the handle 1. A stopper member 14, 140 is fixed with
the protruding end of the small diameter section 112 protruding
from the handle 1. In this embodiment, the large diameter section
111 of the pin member 11 is cylindrical, while the cross-section of
the small diameter section 112 of the pin member 11 has two long
sections 113 and two short sections 114. The distance between the
long sections 113 is defined as a first length 1131, while the
distance between the two short sections 114 is defined as a second
length 1141. The first length 1131 is longer than the second length
1141.
[0025] The tool structure of the present invention further includes
a tool head 2 composed of two clamping members 21. The clamping
members 21 are pivotally connected with each other via a head pivot
shaft 22. The handle pivot shaft 12 is spaced from the head pivot
shaft 22 by a certain distance. Each clamping member 21 has an
insertion section 23 formed with an insertion notch 24. The
insertion notch 24 has an opening 25 with a width smaller than the
inner diameter of the insertion notch 24 and the diameter of the
large diameter section 111 of the pin member 11. The width of the
opening 25 is larger than the diameter of the small diameter
section 112 of the pin member 11. Accordingly, in normal state, the
large diameter sections 111 of the pin members 11 can be pivotally
disposed in the insertion notches 24 of the insertion sections 23.
In addition, the width of the opening 25 is smaller than the first
length 1131 and larger than the second length 1141.
[0026] Each handle 1 has a handle locating point 13 near the handle
pivot shaft 12, whereby the handles 1 can be truly closed and
located. The insertion section 23 of the clamping member 21 also
has a head locating point 26, whereby the tool head 2 can be truly
closed and located.
[0027] The stopper member 14 is screwed on the protruding end of
the small diameter section 112 of the pin member 11. A spring 15 is
disposed between the stopper member 14 and the handle 1. Two ends
of the spring 15 respectively abut against the stopper member 14
and the handle 1. After the pin member 11 is pressed, the spring 15
can restore the pin member 11 to its home position where the large
diameter section 111 is positioned in the handle 1.
[0028] In this embodiment, a switch plate 16 is disposed on the
protruding ends of the small diameter sections 112 of the pin
members 11. A middle section of the switch plate 16 is formed with
a press face 161 between the two pin members 11. One stopper member
14 of the stopper members is formed with a receptacle 141 having a
stopper section 142. The switch plate 16 has a chucked section 162
corresponding to the receptacle 141 of the stopper member 14. In
addition, the switch plate 16 has a driving section 163 adjacent to
the chucked section 162.
[0029] According to the above arrangement, when replacing the tool
head 2 with another tool head with different usage, the handles 1
and the tool head 2 can be closed to complete the replacement. Via
the driving section 163, a user can push the switch plate 16 to a
true position where the chucked section 162 of the switch plate 16
is placed in the receptacle 141 of the stopper member 14. When the
user presses down the press face 161 of the switch plate 16, the
chucked section 162 of the switch plate 16 is stopped by the
stopper section 142 of the receptacle 141. At the same time, the
two pin members 11 are driven to axially move to make the large
diameter sections 111 of the pin members 11 move out of the handles
1. Also, the short sections 114 of the small diameter sections 112
of the pin members 11 are aligned with the openings 25 of the tool
head 2. At this time, the tool head 2 can be detached from the
handles 1. The insertion sections 23 of another tool head 2 can be
inserted into the handles 1 and the small diameter sections 112 of
the pin members 11 are inserted into the insertion notches 24 of
the tool head 2. Then, the pin members 11 are released to make the
large diameter sections 111 of the pin members 11 inserted into the
insertion notches 24 of the tool head 2. At this time, the
replacement is completed.
[0030] According to the above arrangement, the present invention
has the following advantages: [0031] 1. The handle pivot shaft is
spaced from the head pivot shaft by a certain distance. Also, the
pin members of the handles are pivotally fitted in the insertion
notches of the tool head so as to form a double-lever structure for
saving strength. Furthermore, when replacing the tool head, a user
only needs to press the pin members of the handles with a hand to
easily replace the tool head with another tool head with different
usage, such as a scissors, a pincers, etc. The replacement can be
completed without using any tool. Therefore, the tool head can be
quickly assembled with the handles. [0032] 2. The switch plate is
disposed on the pin members of the handles. When a user presses the
press face of the middle section of the switch plate, the two pin
members are simultaneously pressed down to conveniently replace the
tool head. [0033] 3. One of the stopper members is formed with a
receptacle having a stopper section. The chucked section of the
switch plate is chucked in the stopper member, whereby the switch
plate prevents the handles from being freely opened. When not used,
the two handles will not be unexpectedly opened to cause danger.
[0034] 4. Each insertion section of the tool head has a head
locating point, whereby when replacing the tool head, the tool head
can be truly closed and located. [0035] 5. Each handle has a handle
locating point near the handle pivot shaft, whereby when replacing
the tool head, the handles can be truly closed and located in a
position for easily replacing the tool head. [0036] 6. The small
diameter section of the pin member is a flattened cylinder. Only
when the tool head and the handles are closed, the tool head can be
assembled with the handles. That is, the tool head and the handles
must be fixed at a specific angle for the assembly. This ensures
the safety in replacement of the tool head.
[0037] FIGS. 6 and 7 show a second embodiment of the present
invention, which is different from the first embodiment in that
each handle 1A has a leaf spring 17A. The pin member 11A has a head
end section 115A adjacent to the large diameter section 111A. The
leaf spring 17A abuts against the head end section 115A, whereby
after pressed, the large diameter section 111A of the pin member
11A can be restored to its home position in the handle 1A. This
embodiment can achieve the same effect as the first embodiment.
[0038] FIG. 8 shows a third embodiment of the present invention,
which is different from the first embodiment in that both the large
diameter section 111B and small diameter section 112B of the pin
member 11B are cylindrical. When replacing the tool head 2B, it is
unnecessary to open or close the handles 1B and the tool head 2B to
a specific angle. That is, the replacement can be performed without
closing the tool head 2B and, the handles 1B. A user only needs to
press the pin members 11B of the handles 1B to replace the tool
head 2B. This is quite convenient to the user. This embodiment can
also achieve the same effect as the first embodiment.
[0039] The above embodiments are only used to illustrate the
present invention, not intended to limit the scope thereof. Many
modifications of the above embodiments can be made without
departing from the spirit of the present invention.
* * * * *